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Physics Seminar - Dr John Helm

Monday, 22 May 2017

Physics Department

Dr John Helm

Postdoctoral Fellow

Department of Physics

University of Otago

"Spin-Orbit Coupled Interferometry with Ring-Trapped Bose-Einstein Condensates"

We propose a method of atom-interferometry using a spinor Bose-Einstein (BEC) and the well-established experimental technique of time-varying magnetic fields as a coherent beam-splitter. Our protocol creates long-lived superpositional counterflow states, which are of fundamental interest and can be made sensitive to both the Sagnac effect and magnetic fields on the sub micro-Gauss scale. We split a ring-trapped condensate, initially in the mf=0 hyperfine sub-level, into superpositions of both internal spin state and condensate superflow, which are spin-orbit coupled. After interrogation a relative phase accumulation can be inferred from a population transfer to the mf=±1 states. We present numerical and analytical treatments of our system.

WHEN: Monday 22 May 2017
WHERE: Room 314, Science 3 Building
TIME: 3.00 pm–4.00 pm

All interested are welcome to attend

Light refreshments to follow in Common Room